We all love Edward Tufte (perhaps too much), but if you want a more consistent and articulate data visualization theory you must read the French cartographer Jacques Bertin.

And did you know that one of the best (and remarkably unknown) data visualization experts is Rolf Hichert, from Germany? Unfortunately he isn’t eager to share his ideas in English (and if you try to translate his site, Google completely messes up the site layout).

If you know French you can read Bernard Lebelle’s Impact Visuel about charts and dashboards (“tableaux de bord“) in Excel. Bernard is a regular commentator here and a while back he was kind enough to send me a copy of one of his books, Convaincre avec des graphiques efficaces. I definitively recommend it.

I am sure there are great non-English blogs and sites out there, and I’d like to know them.  Can you help me?  I’m interested specifically in data visualization for business, not the entire data visualization field. Please leave a link in the comments and if possible a short description including country and language. Please don’t submit echo chamber and Excel tips & tricks blogs. The plan is to create a directory of non-English data visualization blogs and sites.

Thanks. Gracias. Merci. Obrigado. Dank. Grazie. Arigato. Dankon.